hello everyone its me again with same problem had a new condensing boiler fitted with the warm front scheme about 6wks or so ago and the radiators still wont get hot. finally got them to send someone out again who came today and sed it just needed balancing turned down the heat on other radiators that only get luke warm anyway and sed it would be fine and left he was here 5 mins if that but it is still not getting hot infact living room one is stone cold now ive had my heating on from 7am til 8pm today with the boiler turned up full whack and the room stat has only reached 15 degrees the first guy that come said the same and balancing didnt work the first time either i did get a plumber owt just too look at it and he said it is because they have teed into the system microbore flow &return insted of bigger diameter pipe but when i asked the man who came today he sed that had nothing to do with it cud that be the problem cause the plumber has agreed to tee it into a bigger pipe for a reasonable price or his the man today right and it dosent matter sorry for lomg post just well confused thank you

i never stop for breath wen im talking lol. it was warm front who sent the guy out. the company who fit it just wont come out at all. explained that to warm front n they said the company who fit it is not liable after 30 days so now no-one wants to help. so fitters wont come back. n warm front says it just needs balancing . which is rubbish! so were they teed into the flow and return im thinking of upgrading the pipe work from 10mm to either 15mm or 22mm will this help the radiators heat up better ? sorry for confusing everybody with last post just frustrated wish i kept my old boiler now lol

No! This is not right. You should not accept the rubbish about 30 days.

Firstly, find out what the problem is, secondly, write to Warm Front and tell them unless they fix it, you are going to get it done and send them the bill.

It doesn't seem like balancing, to to be quite honest, I have tried to read your post, but cannot understand it. Break the problem down, and explain with as much detail as possible what is happening, and how the system is connected, and type of boiler and controls you have.

hello plumbob it is a vaillent condensing boiler. the boiler seems to be working fine, i have the boiler turned up to max ,but i can have the heating running all day but the radiators only get luke warm, xcept the radiator thats in same room as boiler (first radiator on the circuit) that gets red hot. the flow and return pipework from the boiler to the first radiator is a small lenghth of 22mm then reduces to 15mm for about 3ft, then tees into the first radiator in 10mm and then the circuit continues in 10mm up to the second floor , and that is what a independent plumber said was the problem ,he said the pipework to the second floor needs to be bigger what do you think ? it is controlled by a wireless room stat/programmer and has the old valves on the radiators ie they didnt put any thermostatic valves on for us thank you for your replys

The main feed pipes from the boiler must be in 22mm up to the point it supplies only two rads where it can drop to 15mm or 10mm if only one rad.

It is never going to run right if you have 15mm running the whole house. If the new boiler positioning is different to the old one then they might have tapped it into the system in the wrong place, and to be honest anything could be happening. The narrow bore pipes may not be the only problem.

If you turn off any rads that get fully hot, what happens to the rest?

On another point, thermostatic valves should have been fitted as they are now a requirement, not an option.

hello plumbbob, yes the boiler is in a new position, we use to have a back boiler,and the radiator they tapped into used to be the last radiator on the circuit . the pipework comes from second floor and drops down the wall to the first floor in 10mm and thats the pipework theyv tapped into, hope that makes sense ? when i turn off all the radiators and just leave the living room one on , it does get hotter (ie living room one is most affected) also were they took out the old cylinder what was in the loft , they capped off the flow and return pipes up there , is it possible it cud be air trapped or something (sorry if that sounds stupid just guessing) and the fitters said i didnt need thermastatic valves with that boiler . obviously that was untrue ! thank you for your replys ( ps the living room radiator is brand new what the fitters installed . )